Issue |
A&A
Volume 691, November 2024
|
|
---|---|---|
Article Number | A352 | |
Number of page(s) | 19 | |
Section | Catalogs and data | |
DOI | https://doi.org/10.1051/0004-6361/202450509 | |
Published online | 27 November 2024 |
PEWDD: A database of white dwarfs enriched by exo-planetary material
1
Department of Physics, University of Warwick,
Coventry
CV4 7AL,
UK
2
Centre for exo-planets and Habitability, University of Warwick,
Coventry
CV4 7AL,
UK
3
Center for Astrophysics | Harvard & Smithsonian,
60 Garden St.,
Cambridge,
MA
02138,
USA
★ Corresponding author; jamietwilliams.astro@gmail.com
Received:
25
April
2024
Accepted:
23
September
2024
We present the Planetary Enriched White Dwarf Database (PEWDD), a collection of published photospheric abundances of white dwarfs accreting planetary debris alongside additional information relevant to metal-enrichment and the presence of infrared excesses, emission lines, and binary companions. At the time of publishing, PEWDD contains information on 1739 white dwarfs and will be kept up to date with information from new publications. A total of 24 photospheric metals are recorded and are linked to accretion of exo-planetary material. The overall properties of metal-enriched white dwarfs are severely affected by observational selection effects. In particular, we find that the metals that are detectable strongly correlate with the effective temperature. By considering metal-enriched white dwarfs that have abundances measured by different methods, we find a spread that is comparable with the often-quoted ad hoc estimated abundance uncertainties, namely ≃0.1−0.2 dex. We draw attention to a dichotomy in the median accretion rates for metal-enriched H- and He-dominated white dwarfs, with Ṁacc,H = 7.7 × 107g s−1 and Ṁacc,He = 8.7 × 108g s−1, when extrapolating bulk compositions from bulk Earth Ca abundance. We identified 40 metal-enriched white dwarfs in binary systems and find evidence that enrichment is suppressed by binary companions within 200 au.
Key words: planets and satellites: composition / stars: abundances / white dwarfs
© The Authors 2024
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
This article is published in open access under the Subscribe to Open model. Subscribe to A&A to support open access publication.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.